Reminder and Complaint

So i joined the community

There now my Reminder and Complaint.

It would be nice, if some of you could check them. Specially whether the business phrases are used in the right way.

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Task II - Reminder

Gartenlaube GmbH
Weiherstraße 9
55545 Bad Kreuznach
Germany

Walnut Grove
Lake View
B57 4LM Birmingham 21 May 2010
England

Dear Mr Green

Our records show that we have not yet received payment for your invoice about 1200 € of 04th April 2010 since the last two telephone reminders. You promised me in the last phone call at 7th May the immediate payment of the invoice.
I´m suprised because we had until now always a good and trouble-free relationship with the firm Walnut Grove. Still useable, I am ready to give you a final deadline of 14 days, that is until 04 June.
If paymen has already been effected in the meantime, please disregard this letter.
Please let me know if I can help further in any way.

Yours sincerely
- Simon Weiß

Task III - Complaint

Landgeräte-Großhandel Winter GmbH
Bad Kreuznach
Germany

Gardening Tools Ltd
25 Baker Street
Leeds LDE 6NN 21 May 2010
England

Dear Sir or Madam,

We regret to say that on opening delivery of 30 wheelbarrows and 12 chain-saws we found that the goods have given cause for complaint. We can´t sell 10 wheelbarrows because the bases rustet through. Additionally 5 chain-saws of the type woodfarmer missing. Already we have returned the defektive wheelbarrows of your costs. Please send us as soon as possible replacement for the wheelbarrows. We also ask for the delivery of the missing chain-saws. Please deliver the goods by 30th May at the latest. Please confirm receipt of this letter.
We are sure that you will understand our position.

Yours sincerely
- Simon Weiß

Thanks for your help!